Valve length tolerance measuring attachment for valve stem grinders



June 13, 1950 E. HEATH ETAL 2,511,583 I VALVE LENG TOLERANCE MEASURING ATTACHMENT FOR VALVE STEM GRINDERS Filed Oct. 8, 1948 'i i 1. .g 8 s H 5 pu FIG. 2

50 70 FIG. 4 I00 7 K);

INVENTORS ERNESTE. HEATH 8 GEO/L X HEARN ZZWJQ/M AGENT Patented June 13, 1950 VALVE-LENGTH ToLEnANcE MEASUR- ING ATTACHMENT FOR vALvE S EM 1 Ernest E. HeathJS an' Diego, and Cecil Y. Hearn, ElgCajon, Calif.,a.ssignors to Bay Shore Motors, San Diego, Calif., a corporation of California gipplicationioct obcr s, 1948, Serial No. 53,568

Our invention relates to'a valve length tolerance measuring attachment for valve stem grinders, and the objects of our invention are? First, to provide a measuring attachment of i this class which greatly "facilitates the grinding of valve stems to a length tolerance" after the valves have been faced, whereby precise tappet clearance of each individual valve may be readily and easily accomplished'in a minimum of time.

Second, to provide a valve length tolerance measuring attachment of this class which operates in connection with" a conventional valve" Fourth, to provide a measuring "attachment'of this class which is very readily and'easily setup for various valves of various sizes. 1

Fifth, to provide a measuring attachment of this class which may be readily andeasily connected to conventional valve stem grinding machines. v

1. Sixth, to provide a measuring attachment'of this class which promotes extreme accuracy and uniformity in th valve length tolerance measuring operations. I l 1 Seventh, to provide a"measuring attachment of this class which may be zeroed tofit a gage adjusted to a particular tappet and corresponding valve seat whereby the corresponding valve may be finished to a clearance tolerance substantially shorter than the gage by visual inspection" of a dial indicator which registers in units of one thousandth of an inch which may be alternately employed intermediate length-ifacing operations on the valve stem being fitted, and

Eighth, to provide a valve length tolerance measuring attachment for valve stem grinders of this class which is very simple and economical of construction, efficient in operation and which will not readily deteriorate or get out of.-

order.

With these and other objects in view as will appear hereinafter, our invention consists of certain novel features of construction, combination and arrangement of parts and portions, as

will be hereinafter described in detail and par--v ticularly set forth in the appended claimspreference being had to the accompanying drawing 5 Claims. (Cl. 51 --165) and to the characters of reference thereon form- 1 ing apart of this application in which: Figure l is a top or plan view of our valve length tolerance measuring attachment for valve stem grinders, showing by dash lines, the relative position of a valve stem grinder wheel and cross feed table. Figure 2 is an enlarged sectional View taken from the line 22 of Fig. '1. Figure 3 is a side elevational view of our valve length tolerance measuring attachment for valve stem grinders taken substantially degrees to the structure shown in Fig. 1 illustrating by dash lines aportion'of a valve grinder to whichit is connected, and Figure 4 is a side elevational view of our valve length tolerance measuring attachment for valve stem grinders taken from the line 44 of Figure 3.

Similar characters of reference refer to similar parts'anc'l portions throughout the several views of the drawings.

The grinding wheel I, carriage 2, valve stem clamp 3, valve face stop- 4, measuring transfer. plunger 5, spring 6, dial gage 1, screws 8 and 9, and bracket Ill constitute the principal parts and portions of our valve length tolerance measur ing-attachment for valve stem grinders.

The grinding wheel I, carriage 2,. valve stem; clamp 3, and the valve face stop 4 are all con ventional parts of -a conventional valve stem, grinder. The bracket H] is a substantially rec-H tangular block having a hollow screw '9 extendingtherethrough and threaded into the carriage 2,. all as shown best in Fig. 3 of the drawings. The screw 8 extends through the hollow screw 9 and is adapted to engage the stem of the valve stop 4-as shown by dash lines in Figures 1 and 3 of the drawings. This bracket I0 is provided with a bore Illa therethrough in which the measuring transfer plunger 5 is reciprocally mounted.

Around the stem of this plunger 5 is a, coil spring 6 which abuts the head 5a of the plunger 5 tending to force the contact plate 51) of said plunger; toward the bracket 10. This contact plate 51) is provided with a stop pin 50 thereon and a substantially triangular cut out portion 511 adapted to permit projection of the valve stem G into the plane of the grinding wheel I. The dial gauge 1 is a conventional micrometer dial gauge having a reciprocating plunger la which contacts the plunger plate 517 and this dial gauge 1 is provided with a resetting means ltlb which may beused for zeroing the indicator at a certain location assumed by the plate 5b when corv responding with a plug gauge used formeasur ing the distance between a valve seat and a tappet. It will be noted that the spacer 5e sur- The operation of our valve length tolerance: measuring attachment for valve stem grinders is substantially as follows.

A conventional gauge substantially, the..shape,..

of the valve stem C is first inserted inthe valve,

port of an engine and the distance between the valve seat in the engine block and the respective tappet is measured whereupon thelengthof 'the gauge is fixed and the gaugeis-then placed ,in connection with the carriage 2 of the conventional valve grinding machine: and is heldyby the valve stem clamp 3 with the corresponding face portion of the gauge contacting the valve face stop 4. The plunger plate 5b is then placed in the dash lineposition D asshown in Fig. 1 of-thedrawings, contacting the end of the-gauge and the dial indicator '1 bymeans of the recess knob lfib is adjusted to zero whereupon the valve corresponding to the respective port face and tappet'measured replaces the gauge in connectionwith the carriage 2 and clamp 3 The face of'the valve being recently finished is engaged with the valve face stop 4.

A reading" on thedial gauge will then indicate the surplus-length of the valve stem and the operator may thengrasp knob 5a, of the plunger 5 and rotate the plate 51) to the notch 5d so that'it will pass theend of the valve stem C longitudinally thereof and recede to the solid line position as shown in Figure 1 of the drawings under compressiveforce of the spring 6, thus the stem C as shown in Figure 4' of the drawings projects beyond the plate 5b permitting the same to be cut on the surface of the grindingwheeb I, itbeing" noted that the carriage Z'is movable in the directions as indicated, by the arrows A and B in" Figure 1 of the drawings, and this carriage provided with micrometer adjustments so that the operator can' precisely feed the valveinto; Afteran approximate-cut the grinding wheel. is made, the'plate 5b is again placed in the dash line position D whe'reuponit is followed by the plunger 1a. of the dial'indicator which will indicate substantially shorter length" of the valve stem C'which' should bring theread ing back to substantially zero as-shown in-Fig; 1"

of the drawings, or the reading maybe minus tolerance of the measurement of-the gauge-for" proper clearance of the stem as desired; thus" precise measurement of thev lengthof'the valve' fromthe face to the-end" of the stem may be" made with each cut on the wheell until the valve;

stem C'is substantially shorter than the setting) of the gauge so that tappet clearancewill be proper. for the respective-valve port face and,

combination and, arrangement substantially as setforth in the appended'claims.

Having thusdescrilbed our invention, what we claim as new and desire to secure by. Letters Patent is:

1., In a, valve length tolerancemeasuring, attachment-v for valve, stemgrinders, the com-.-

bination with, a grinding wheel, a conventional compound carriage, movable relatively thereto, of a bracket on said carriage, a dial gauge provided with a plunger on said bracket, a plunger reciprocally mounted in said carriage having a plate; thereon engageable withithe; plunger of said dial gauge,-a clamp on' said carriage adapted to hold a valve stem, a valve face stop in connection with said carriage for contacting the face.of..a,.,valve,, said plate having an opening therein. .adap,ted; to'by-pass the tappet end of said'valve longitudinally thereof.

2. In a valve length tolerance measuring attachment: for: valvecstem grinders, the combination" with, a-= grinding wheel, a conventional compound'carriage; movable relatively thereto, of abracket: on: said carriage, a dial provided with a plunger gauge on said bracket, a plunger 1 reciprocally mounted in said carriage having a plate thereon engageable with the plunger of said dialfgauge; a-clamp on said carriage adapted to hold avalverstem, a-valve face stop in connection with said.,1carriage for contacting the: face of a valve, said plate having an opening therein adapted to-by-pass the tappet, end of? said; valve longitudinally thereof, and a spring; for forcing: said; plate toward said dial indi,-- cator' for' deflecting the: plunger thereof.

3; In a measuringxattachmentfor valve-stem. grinders of, the class described, a valve stem clamp, a carriage on which said clamp is positioned, a' valve facestopin connection with said carriage, a plungerchaving a-plate thereon pro vided withxa cut" outportion adapted to by-pass. saidvalve stemlongitudinally thereof, a diali gauge operatively connected with said plate.

4. In a measuringattachment for valve; stem. grinders: of: the class described, a valve stem clamp; a carriage on which said clamp is posi-- tioned; a valveface stoprin; connection with said.- carriage, a'zplungerrhavinga plate. thereon provided withs. aicutzout portion adapted to by-passr said fvalver stem longitudinally. thereof, adial gauge'operatively; connected with said plate, a',, spring tending togforcessaid plateinto engage,- ment 'with the endrof :a valve in said clampand into engagement withvsaidi dial, indicator.

5; In-a measuring attachment for valvestem grinders of the class described, a valve stema. clamp, a: carriage on which said clamp is positioned; a, valve face stop inconnection with' said': carriage a plunger having-a plate thereon provided with a cut out portion adapted to by-pass: said valve-stemlongitudinally thereof, a: dial gauge operatively connectedxwitn said plate; as Springtendingto force-.- said plateinto engage-- ment with the" end of? a valve insaid clamp; and" into: engagement-with I said dial indicator; a stop pin' in: connection with-said plate engageable with thestem of' a valve when said platee isrotated-"past said cut'raway-portion about the: axis ofsaid plunger:

ERNEST HEATH: CECIL Y. HEARN;

REFERENGES CITED The "following references "are of record'in the: file of-this patent:

UNITEDSTATES PATENTS Number Name Date;

1;942;209= Graves et all Jan; 2; 1934s 2,032,538 Kulp-eta-l Maru3, 1936-? 2,151,528 Preston" Mar; 21,1939:

22393 040 Green: Jan. 153.1946; 

